Check Power Supply; Controls - Tektronix CURVE-TRACER 576 Instruction Manual

Performance Check/Calibration-Type 576
TABLE 5-4
CAL Button Voltage Checks
HORIZONTAL Voltage Accuracy
Switch at Pin Z
(COLLECTOR)
2 V 2 V ±0.0 1
v
1
v
1V ±0.005
v
.5
v
.5
v
±0.0025
v
n. CHECK FOR-Voltages given in Table 5-4 for each
setting of the VERTICAL switch ±0.5%.
o . Disconnect the DC voltmeter from the Type 576.
p. Set the HORIZONTAL switch to 1 V COLLECTOR.
4. Check Power Supply Regulation
a. Trigger the test oscilloscope on the internal line signal.
b. Connect the 1X test probe ground clip to pin M on
the L.V. REGULATOR circuit board.
c. Set the autotransformer for the highest voltage within
the voltage range selected by the Line Voltage Selector
assembly on the rear panel.
d. Connect the 1 X test probe tip to the test points of
each of the power supplies given in Table 5-3.
e. CHECK FOR-Test oscilloscope display of power
supply ripple with the line frequency ripple peak -to-peak
amplitude not exceeding the maximum value given in Table
5-3. On the +100-volt and the +225-volt supplies, set the
test oscilloscope time/em to 50 ]Js and check the 20 kHz
ripple.
f. Set the autotransformer for the lowest voltage within
the voltage range selected by the Line Voltage Selector
assembly on the rear panel.
g. Repeat parts d and e.
h. Disconnect the probe from the Type 576 and the test
oscilloscope vertical input.
®
VERTICAL Voltage Accuracy
Switch at Pin C
(COLLECTOR)
5mA 1.25
v
±0.00625
v
2mA
0.5
v
±0.0025
v
1 mA 0.25
v
±0.00 125
v
i. Disconnect the Type 576 from the autotransformer
and connect it directly to the power source, or set the
autotransformer output voltage to the center of the regu-
lated range selected by the Line Voltage selector assembly.
CRT AND READOUT
5. Adjust CRT Controls
0
a. Turn the Type 576 FOCUS control fully counter-
clockwise and adjust INTENSITY control for a large spot
on the CRT.
b. Check for spot having a circular shape.
c. ADJUST- R891, ASTIGMATISM adjustment on the
operator's left side of the instrument (see Fig. 5-4), if the
spot is not circular.
d. Turn the Type 576 FOCUS control clockwise until
the spot is the smallest possible.
Fig. S-4. Location of adjustments in stepS.
5-7